It really depends on the type of plant. some will just lose their leaves as a defence mechanism to conserve water loss thru transpiration. Plenty have the capacity to be revived, plenty don't. You'll just have to do your best.
Please label everything just in case so you know what's what.
Cut off the dead and dying stuff as it will do nothing for recovery and just provide a haven for disease. DON'T overwater, in fact if the pots have been sufficiently re-wetted just leave them alone as the plant needs time to recover and won't be drawing up much moisture and you will drown the roots.
Be very very patient.

Leaves can't be revived once they're dead. "Completely dry and crispy " translates to dead! However, the leaves can be dead without taking the whole plant with them. Depending upon the kind of plant, new growth can emerge from the stems or crown.

It would be very helpful if we knew what kind of plants you're worried about.

Well the current plant I'm worried about is a Miracle Fruit plant. Seriously, one day it was fine, the next day all leaves are crispy. And it was after maybe 4-5 days without water..It never wilted, just dried up.

I too have a number of plants and recently purchased two miraclech have gone crispy so I'm curious to find out what the correct answer is because I spent quite a lot of money on these